CT of my head in 2025

What is that device in my bottom right molar and what is it used for? This was placed in my tooth in 2024 while at my dentists. A week later, Mike the Molar called and said the dentist needs me to come in so she could fix it. I told them, “I don’t feel anything wrong.” But I went anyway. She, the dentist reefed on my tooth that I thought she was going tp pull my jaw out. She reefed so much, I find it intriguing and if it is a ‘listening’ device, I could see why she reefed on my tooth the way she did.  I told her that, “I think it wants to stay.” So, it did. 

But now on reflection, my privacy has been obliterated. They know everything I say, and do. Night and day. How is this possible? Is there fluid around my brain?